linux-kernel - Re: [PATCH v11 2/8] power: add power sequence library

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Date:   Tue, 10 Jan 2017 15:02:41 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>, rjw@...ysocki.net
Cc:     Peter Chen <peter.chen@....com>, mark.rutland@....com,
        ulf.hansson@...aro.org, heiko@...ech.de, stephen.boyd@...aro.org,
        linux-kernel@...r.kernel.org, gary.bisson@...ndarydevices.com,
        festevam@...il.com, stillcompiling@...il.com, arnd@...db.de,
        dbaryshkov@...il.com, vaibhav.hiremath@...aro.org,
        mka@...omium.org, stern@...land.harvard.edu,
        devicetree@...r.kernel.org, mail@...iej.szmigiero.name,
        pawel.moll@....com, linux-pm@...r.kernel.org,
        s.hauer@...gutronix.de, troy.kisky@...ndarydevices.com,
        robh+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
        hverkuil@...all.nl, oscar@...andei.net, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, rjw@...ysocki.net, sre@...nel.org,
        broonie@...nel.org, p.zabel@...gutronix.de, shawnguo@...nel.org
Subject: Re: [PATCH v11 2/8] power: add power sequence library

On Sat, Jan 07, 2017 at 10:54:56AM +0200, Krzysztof Kozlowski wrote:
> On Thu, Jan 05, 2017 at 02:01:53PM +0800, Peter Chen wrote:
> > We have an well-known problem that the device needs to do some power
> > sequence before it can be recognized by related host, the typical
> > example like hard-wired mmc devices and usb devices.
> > 
> > This power sequence is hard to be described at device tree and handled by
> > related host driver, so we have created a common power sequence
> > library to cover this requirement. The core code has supplied
> > some common helpers for host driver, and individual power sequence
> > libraries handle kinds of power sequence for devices. The pwrseq
> > librares always need to allocate extra instance for compatible
> > string match.
> > 
> > pwrseq_generic is intended for general purpose of power sequence, which
> > handles gpios and clocks currently, and can cover other controls in
> > future. The host driver just needs to call of_pwrseq_on/of_pwrseq_off
> > if only one power sequence is needed, else call of_pwrseq_on_list
> > /of_pwrseq_off_list instead (eg, USB hub driver).
> > 
> > For new power sequence library, it can add its compatible string
> > to pwrseq_of_match_table, then the pwrseq core will match it with
> > DT's, and choose this library at runtime.
> > 
> > Signed-off-by: Peter Chen <peter.chen@....com>
> > Tested-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>
> > Tested-by Joshua Clayton <stillcompiling@...il.com>
> > Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
> > Tested-by: Matthias Kaehlcke <mka@...omium.org>
> 
> Acked-by: Krzysztof Kozlowski <krzk@...nel.org>
> Tested on Odroid U3 (reset sequence for LAN9730):
> Tested-by: Krzysztof Kozlowski <krzk@...nel.org>
> 

A nice ping...

-- 

Best Regards,
Peter Chen